A four-year lidar-sun photometer aerosol study at São Paulo, Brazil

Landulfo, E; Papayannis, A; Torres, AS; Uehara, ST; Pozzetti, LMV; de Matos, CA; Sawamura, P; Nakaema, WM; de Jesus, W

dc.contributor.author	Landulfo, E	en
dc.contributor.author	Papayannis, A	en
dc.contributor.author	Torres, AS	en
dc.contributor.author	Uehara, ST	en
dc.contributor.author	Pozzetti, LMV	en
dc.contributor.author	de Matos, CA	en
dc.contributor.author	Sawamura, P	en
dc.contributor.author	Nakaema, WM	en
dc.contributor.author	de Jesus, W	en
dc.date.accessioned	2014-03-01T02:45:01Z
dc.date.available	2014-03-01T02:45:01Z
dc.date.issued	2008	en
dc.identifier.issn	0739-0572	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32104
dc.subject.classification	Engineering, Ocean	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.other	Aerosol backscattering	en
dc.subject.other	Aerosol optical thickness	en
dc.subject.other	Aerosol robotic networks	en
dc.subject.other	Backscatter coefficients	en
dc.subject.other	Cloud base	en
dc.subject.other	Cloud properties	en
dc.subject.other	Dry and wet	en
dc.subject.other	Extinction coefficients	en
dc.subject.other	Extinction-to-backscatter ratio	en
dc.subject.other	Input values	en
dc.subject.other	LIDAR data	en
dc.subject.other	Lidar ratio	en
dc.subject.other	Lidar systems	en
dc.subject.other	Lower troposphere	en
dc.subject.other	Phase functions	en
dc.subject.other	Planetary boundary layers	en
dc.subject.other	Single scattering albedo	en
dc.subject.other	Structure and dynamics	en
dc.subject.other	Suburban areas	en
dc.subject.other	Sun photometers	en
dc.subject.other	Sun-tracking	en
dc.subject.other	Temporal Database	en
dc.subject.other	Vertical profile	en
dc.subject.other	Visible spectral regions	en
dc.subject.other	Wet season	en
dc.subject.other	Acoustic emissions	en
dc.subject.other	Atmospheric aerosols	en
dc.subject.other	Atmospheric thermodynamics	en
dc.subject.other	Backscattering	en
dc.subject.other	Electric reactors	en
dc.subject.other	Image sensors	en
dc.subject.other	Oceanography	en
dc.subject.other	Optical radar	en
dc.subject.other	Photometers	en
dc.subject.other	Photometry	en
dc.subject.other	Sun	en
dc.subject.other	Atmospherics	en
dc.subject.other	absorption	en
dc.subject.other	aerosol	en
dc.subject.other	aerosol property	en
dc.subject.other	boundary layer	en
dc.subject.other	conference proceeding	en
dc.subject.other	database	en
dc.subject.other	lidar	en
dc.subject.other	measurement method	en
dc.subject.other	photometer	en
dc.subject.other	satellite data	en
dc.subject.other	troposphere	en
dc.subject.other	vertical profile	en
dc.subject.other	Brazil	en
dc.subject.other	Sao Paulo [Brazil]	en
dc.subject.other	South America	en
dc.title	A four-year lidar-sun photometer aerosol study at São Paulo, Brazil	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1175/2007JTECHA984.1	en
heal.identifier.secondary	http://dx.doi.org/10.1175/2007JTECHA984.1	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	A backscattering lidar system, the first of this kind in Brazil, has been used to provide the vertical profile of the aerosol backscatter coefficient at 532 nm up to an altitude of 4-6 km above sea level (ASL), in a suburban area in the city of São Paulo. The lidar system has been operational since September 2001. The lidar data products were obtained in a 4-yr period (2001-04) and concerned the aerosol optical thickness (AOT), the aerosol backscattering and extinction coefficients at 532 nm, cloud properties (cloud base, thickness), planetary boundary layer (PBL) heights, aerosol layering, and the structure and dynamics of the lower troposphere. The lidar data are presented and analyzed in synergy with AOT measurements obtained by a Cimel sun-tracking photometer in the visible spectral region, not only to validate the lidar data but also to provide an input value of the so-called extinction-to-backscatter ratio [lidar ratio (LR)]. A correlation between the lidar data and the data obtained by a Cimel sun-tracking photometer [belonging to the Aerosol Robotic Network (AERONET)] is being made to set a temporal database of those data that were collected concomitantly and to cross correlate the information gathered by each instrument. The sun photometer data are used to provide AOT values at selected wavelengths and thus to derive the Ångström exponent (AE) values, single scattering albedo (SSA) and phase function values, and LR values. The analysis of these data showed an important trend in the seasonal signature of the LR indicating a change of the predominant type of aerosol between the dry and wet seasons. Thus, during the wet season the LR lidar values are greater (50-60 sr), which indicates that larger absorption by the aerosols takes place during this period. The corresponding AE values range between 1.3 and 2 for both periods. © 2008 American Meteorological Society.	en
heal.publisher	AMER METEOROLOGICAL SOC	en
heal.journalName	Journal of Atmospheric and Oceanic Technology	en
dc.identifier.doi	10.1175/2007JTECHA984.1	en
dc.identifier.isi	ISI:000259153700017	en
dc.identifier.volume	25	en
dc.identifier.issue	8	en
dc.identifier.spage	1463	en
dc.identifier.epage	1468	en